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Byju's Answer

Standard XII

Physics

Acceleration

Three blocks ...

Question

Three blocks with masses $m, 2 m$ and $3 m$ are connected by strings, as shown in the figure. After an upward force $F$ is applied on block $m,$ the masses move upward at constant speed $v$ . What is the net force on the block of mass $2 m ?$ ( $g$ is the acceleration due to gravity)

6 m g

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Zero

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2 m g

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3 m g

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Solution

The correct option is B Zero
$F = mass \times acceleration$

Since, the given system is moving with a constant velocity. Hence, there will be no net acceleration.

$\Rightarrow F_{n e t} = m \times 0 = 0$

 Hence, $(B)$ is the correct answer.

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Three blocks with masses m, 2m and 3m are connected by strings, as shown in the figure. After an upward force F is applied on block m, the masses move upward at constant speed v. What is the net force on the block of mass 2m? (g is the acceleration due to gravity)

The correct option is B ZeroF=mass×acceleration Since, the given system is moving with a constant velocity. Hence, there will be no net acceleration. ⇒ Fnet=m×0=0  Hence, (B) is the correct answer.

Three blocks with masses $m, 2 m$ and $3 m$ are connected by strings, as shown in the figure. After an upward force $F$ is applied on block $m,$ the masses move upward at constant speed $v$ . What is the net force on the block of mass $2 m ?$ ( $g$ is the acceleration due to gravity)